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| author | Christian Hitz <christian.hitz@aizo.com> | 2011-10-12 09:31:59 +0200 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2012-01-26 16:09:02 -0600 |
| commit | 4c6de8560cb42a6b6c2d565d41b6801e4b02d4b3 (patch) | |
| tree | 1244963352384b2b50a920020bab7370918c303e /drivers/mtd/nand/nand_base.c | |
| parent | 4d2aee2b3681234691b102194cc2f14857272828 (diff) | |
| download | talos-obmc-uboot-4c6de8560cb42a6b6c2d565d41b6801e4b02d4b3.tar.gz talos-obmc-uboot-4c6de8560cb42a6b6c2d565d41b6801e4b02d4b3.zip | |
nand: Merge BCH code from Linux nand driver
[backport from linux commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe]
This patch merges the BCH ECC algorithm from the 3.0 Linux kernel.
This enables U-Boot to support modern NAND flash chips that
require more than 1-bit of ECC in software.
Signed-off-by: Christian Hitz <christian.hitz@aizo.com>
Cc: Scott Wood <scottwood@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'drivers/mtd/nand/nand_base.c')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 27f6c776b0..b03953f5b9 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -43,6 +43,7 @@ #include <linux/mtd/mtd.h> #include <linux/mtd/nand.h> #include <linux/mtd/nand_ecc.h> +#include <linux/mtd/nand_bch.h> #ifdef CONFIG_MTD_PARTITIONS #include <linux/mtd/partitions.h> @@ -2763,7 +2764,7 @@ int nand_scan_tail(struct mtd_info *mtd) /* * If no default placement scheme is given, select an appropriate one */ - if (!chip->ecc.layout) { + if (!chip->ecc.layout && (chip->ecc.mode != NAND_ECC_SOFT_BCH)) { switch (mtd->oobsize) { case 8: chip->ecc.layout = &nand_oob_8; @@ -2864,6 +2865,39 @@ int nand_scan_tail(struct mtd_info *mtd) chip->ecc.bytes = 3; break; + case NAND_ECC_SOFT_BCH: + if (!mtd_nand_has_bch()) { + printk(KERN_WARNING "CONFIG_MTD_ECC_BCH not enabled\n"); + return -EINVAL; + } + chip->ecc.calculate = nand_bch_calculate_ecc; + chip->ecc.correct = nand_bch_correct_data; + chip->ecc.read_page = nand_read_page_swecc; + chip->ecc.read_subpage = nand_read_subpage; + chip->ecc.write_page = nand_write_page_swecc; + chip->ecc.read_page_raw = nand_read_page_raw; + chip->ecc.write_page_raw = nand_write_page_raw; + chip->ecc.read_oob = nand_read_oob_std; + chip->ecc.write_oob = nand_write_oob_std; + /* + * Board driver should supply ecc.size and ecc.bytes values to + * select how many bits are correctable; see nand_bch_init() + * for details. + * Otherwise, default to 4 bits for large page devices + */ + if (!chip->ecc.size && (mtd->oobsize >= 64)) { + chip->ecc.size = 512; + chip->ecc.bytes = 7; + } + chip->ecc.priv = nand_bch_init(mtd, + chip->ecc.size, + chip->ecc.bytes, + &chip->ecc.layout); + if (!chip->ecc.priv) + printk(KERN_WARNING "BCH ECC initialization failed!\n"); + + break; + case NAND_ECC_NONE: printk(KERN_WARNING "NAND_ECC_NONE selected by board driver. " "This is not recommended !!\n"); @@ -2989,6 +3023,9 @@ void nand_release(struct mtd_info *mtd) { struct nand_chip *chip = mtd->priv; + if (chip->ecc.mode == NAND_ECC_SOFT_BCH) + nand_bch_free((struct nand_bch_control *)chip->ecc.priv); + #ifdef CONFIG_MTD_PARTITIONS /* Deregister partitions */ del_mtd_partitions(mtd); |
